There is more nitro can do to get more power like more agressive porting and higher nitro percentages like 50%. Heres a heavier savage with Novarrosi 528 xrp wheelies at speed and instant acceleration. Kinda like a brushless with noise and smoke lol.
http://video.google.com/videoplay?do...12325975034856
Top speed run with a os.28 xz
http://www.youtube.com/watch?v=uUJluk2DGU4